56221556 has 12 divisors (see below), whose sum is σ = 98455392. Its totient is φ = 28091448.

The previous prime is 56221553. The next prime is 56221579. The reversal of 56221556 is 65512265.

It is a super-2 number, since 2×56221556² = 6321726718122272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56221553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3191 + ... + 11073.

It is an arithmetic number, because the mean of its divisors is an integer number (8204616).

Almost surely, 2^56221556 is an apocalyptic number.

It is an amenable number.

56221556 is a deficient number, since it is larger than the sum of its proper divisors (42233836).

56221556 is a wasteful number, since it uses less digits than its factorization.

56221556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9670 (or 9668 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 56221556 is about 7498.1034935509. The cubic root of 56221556 is about 383.0901218840.

The spelling of 56221556 in words is "fifty-six million, two hundred twenty-one thousand, five hundred fifty-six".